AD&D-style Paladins
Copyright (c) 1996 by Caliban <caliban@gate.net>

Disadvantages:
-15 Fanaticism (obviously)

-5/10 Intolerance ("will cooperate with characters of
  other alignments only as long as they behave themselves . . . 
  He will not abide the company of those who commit evil
  or unrighteous acts.")
 
-15 Duty, all the time

-10 Sense of Duty, to Good, the Church, or whatever.

-15 Chivalric Code of Honor (for paladins in a medieval
 campaign; -10 for paladins in a swashbuckling campaign, etc.)

 -5 Vow: Never Commit a Chaotic and/or Evil Act

-10 Honesty (i.e., being law-abiding = lawful)

Other minor vows as appropriate: 
 -1 Never own more than ten magic items
 -1 Tithe 10% of all income to Church or charity
 -1 Donate all excess wealth to Church or charity

Of course, some _really_ extreme paladins might have Truthfulness,
and/or the -10-point Vow "Tithe 90% of all income."

Paladin advantages are confusing to me, since I can't decide whether
they should be handled as magic (spells or knacks), psionics, or
clerical magic (from _GURPS Religion_).  For example, they could
be handled as psionics, with Sense Aura, Metabolism Control, Healing,
and Aspect (for the "Aura of Protection" and "Circle of Power").